AMAZON.COM AC Plug In Voltmeter
It has a POT! And it's a DROK! DROK® Flat Plug AC 80-300V Voltage Panel Power Line Volt Test Monitor Gauge Meter AC 110V 220V Digital LCD Voltmeter for RV Boat Camper Household Factory ...
Forum Discussion
I have one. Works great. If you want to adjust it to match, say a quality multi-meter reading there is an adjustment screw inside in the upper right corner...
If display voltage is too high, adjust potentiometer in counter-clockwise
If display voltage is too low, adjust potentiometer in clockwise
If display voltage is too high, adjust potentiometer in counter-clockwise
If display voltage is too low, adjust potentiometer in clockwise
